---------------------------------------------------------- Rocket-List Digest Archive --- Total Messages Posted Thu 03/05/15: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:47 AM - Re: ZK-TWU gear leg update (Vern Little) 2. 07:10 AM - Re: ZK-TWU gear leg update (Nancy and Randy) ________________________________ Message 1 _____________________________________ Time: 04:47:44 AM PST US From: Vern Little Subject: Re: Rocket-List: ZK-TWU gear leg update The only authority I used was Van's wing CG spec http://www.vansaircraft.co m/pdf/RV4wb.pdf All of my arm measurements are actual, not derived from another a/c. Your forward cg spec is outside of Van's limits. Just sayin. If you've flight and landing tested to your limits you are good to go. I know that single place, I like to carry ballast for 3-point landi ngs. The F1 gear is mounted farther fwd and can handle the fwd cg for landi ngs. I Don't recommend using F1 data for Harmon, though. ===== Vernon R. Little | President, Vx Aviation > On Mar 4, 2015, at 3:09 PM, Nancy and Randy wrote: > > Vern, > > I have a Harmon Rocket 2 that I extensively rebuilt and did a full weight a nd CG calculation for. I will attach the spreadsheet I used (borrowed from a nother HR2 guy) that I believe is accurate. My HR2 is a bit lighted at the n ose because I replaced the metal Hartzell prop with an MT two-blade prop. A lso, the prop governor is a little lighter that the one used with the Hartze ll. All told, I probably saved 15 pounds at the nose. You might be interes ted in two other weight and balance products: the one included in the Forefl ight Application for iPad/Phone and another titled "CG Finder Plus". I use b oth/either and they are very accurate. > > On my aircraft, I have the following arm/weight combinations: > Plane: 85.14" / 1229 pounds > Pilot: 105.0" / 210 pounds > Fuel: 86.50" / 252 pounds > Passenger: 136.0" / Varies > Fwd Baggage: 156.0" / Varies ( I split the baggage area for weight/ balance. The "Fwd" area is in front of and above the battery. The "Aft" bag gage areas is behind the battery and all the way to the aft bulkhead.) > Aft Baggage: 187.0" / Varies > I also included parachutes: > Fwd Chute: 114.5" / 15 pounds > Aft Chute: 145.5" / 15 pounds > > The research I have done also indicates a maximum weight of 2000 pounds an d a CG range of 86.76" to 97.40". > > Fly Safe, > Randy Sage > Peachtree City, GA > USA > ----- Original Message ----- > From: Vern Little > To: rocket-list@matronics.com > Sent: Wednesday, March 04, 2015 3:57 PM > Subject: Re: Rocket-List: ZK-TWU gear leg update > > For my Harmon Rocket II: > YMMV > > Vern Little > > > > From: Stuart Hutchison > Sent: Wednesday, March 04, 2015 4:10 AM > To: rocket-list@matronics.com > Subject: Re: Rocket-List: ZK-TWU gear leg update > > Yes mate, fuel pump clearance is often an issue on RV-4 and Rocket aircraf t. I machined and installed an overflow tube (below), turned the open hole i nwards, JB Welded the top and bottom of the shaft where it passes through th e outlet and also JB Welded a flat disc in the hole then smoothed off after i t set. After all, this part's only function is to limit fuel passing into t he crankcase if the diaphragm should rupture. > > <13537m - D300 SHUP.jpg> > > > <13541m - D300 SHUP.jpg> > > I have an actual formal W&B for a mate=99s F1, but I need to check w ith him that I can release it t=99was a paid service. Will l et you know ASAP. > > Cheers, Stu > >> On 4 Mar 2015, at 10:21 pm, Jay McIntyre wrote: >> >> Hi all.... >> After many months of the usual setbacks and so forth we have the Rocket I I ready to fly with a Team Rocket engine mount and legs plus the Hartzell Bl ended Aerofoil 2 blade prop. >> Not too many headaches involved. The engine mount pretty much bolted stra ight in with only the two central pick up points requiring additional tube w ork to pick up the holes on the firewall. Fuel pump clearance was still an i ssue (as it seems to be on most I believe?) >> Other minor muck-arounds were having to relocate the location where the f uel line comes through the firewall and reworking the exhaust pipes where th ey pass by the gear sockets. >> We also had to shim the engine to left in order to get the spinner to mat ch the cowls but I think this was always a bit out of line so it was a good o pportunity to sort it out. >> >> The Team Rocket set-up certainly raises the point of the spinner up about 10 inches or so, thus the aircraft has a more aggressive stance on the grou nd. >> >> We weighed her today and there was minimal change to the empty weight but arm has moved aft 3.5 inches to 87.72" aft of datum. >> >> We don't have any drawings so I was wondering if someone out there could g ive me the moment arms for pilot, passenger, fuel and baggage so I can do so me loaded CG calculations to keep our Feds happy?? >> Our flight limitations sheet lists the forward limit as 83.2" and the aft limit as 93.9" >> >> Thanks to Mark at Team Rocket - he was very helpful! >> >> Best regards, Jay >> New Zealand >> >> >> class="">http://www.matronics.com/Navigator?Rocket-List >> class="">http://forums.matronics.com >> class="">http://www.matronics.com/contribution >> > > > ________________________________ Message 2 _____________________________________ Time: 07:10:06 AM PST US From: "Nancy and Randy" Subject: Re: Rocket-List: ZK-TWU gear leg update Thanks for the review, Vern. I will certainly look into the subject a bit more. Randy ----- Original Message ----- From: Vern Little To: rocket-list@matronics.com Sent: Thursday, March 05, 2015 7:47 AM Subject: Re: Rocket-List: ZK-TWU gear leg update The only authority I used was Van's wing CG spec http://www.vansaircraft.com/pdf/RV4wb.pdf All of my arm measurements are actual, not derived from another a/c. Your forward cg spec is outside of Van's limits. Just sayin. If you've flight and landing tested to your limits you are good to go. I know that single place, I like to carry ballast for 3-point landings. The F1 gear is mounted farther fwd and can handle the fwd cg for landings. I Don't recommend using F1 data for Harmon, though. ===== Vernon R. Little | President, Vx Aviation On Mar 4, 2015, at 3:09 PM, Nancy and Randy wrote: Vern, I have a Harmon Rocket 2 that I extensively rebuilt and did a full weight and CG calculation for. I will attach the spreadsheet I used (borrowed from another HR2 guy) that I believe is accurate. My HR2 is a bit lighted at the nose because I replaced the metal Hartzell prop with an MT two-blade prop. Also, the prop governor is a little lighter that the one used with the Hartzell. All told, I probably saved 15 pounds at the nose. You might be interested in two other weight and balance products: the one included in the Foreflight Application for iPad/Phone and another titled "CG Finder Plus". I use both/either and they are very accurate. On my aircraft, I have the following arm/weight combinations: Plane: 85.14" / 1229 pounds Pilot: 105.0" / 210 pounds Fuel: 86.50" / 252 pounds Passenger: 136.0" / Varies Fwd Baggage: 156.0" / Varies ( I split the baggage area for weight/balance. The "Fwd" area is in front of and above the battery. The "Aft" baggage areas is behind the battery and all the way to the aft bulkhead.) Aft Baggage: 187.0" / Varies I also included parachutes: Fwd Chute: 114.5" / 15 pounds Aft Chute: 145.5" / 15 pounds The research I have done also indicates a maximum weight of 2000 pounds and a CG range of 86.76" to 97.40". Fly Safe, Randy Sage Peachtree City, GA USA ----- Original Message ----- From: Vern Little To: rocket-list@matronics.com Sent: Wednesday, March 04, 2015 3:57 PM Subject: Re: Rocket-List: ZK-TWU gear leg update For my Harmon Rocket II: YMMV Vern Little From: Stuart Hutchison Sent: Wednesday, March 04, 2015 4:10 AM To: rocket-list@matronics.com Subject: Re: Rocket-List: ZK-TWU gear leg update Yes mate, fuel pump clearance is often an issue on RV-4 and Rocket aircraft. I machined and installed an overflow tube (below), turned the open hole inwards, JB Welded the top and bottom of the shaft where it passes through the outlet and also JB Welded a flat disc in the hole then smoothed off after it set. After all, this part's only function is to limit fuel passing into the crankcase if the diaphragm should rupture. <13537m - D300 SHUP.jpg> <13541m - D300 SHUP.jpg> I have an actual formal W&B for a mate=99s F1, but I need to check with him that I can release it t=99was a paid service. Will let you know ASAP. Cheers, Stu On 4 Mar 2015, at 10:21 pm, Jay McIntyre wrote: Hi all.... After many months of the usual setbacks and so forth we have the Rocket II ready to fly with a Team Rocket engine mount and legs plus the Hartzell Blended Aerofoil 2 blade prop. Not too many headaches involved. The engine mount pretty much bolted straight in with only the two central pick up points requiring additional tube work to pick up the holes on the firewall. Fuel pump clearance was still an issue (as it seems to be on most I believe?) Other minor muck-arounds were having to relocate the location where the fuel line comes through the firewall and reworking the exhaust pipes where they pass by the gear sockets. We also had to shim the engine to left in order to get the spinner to match the cowls but I think this was always a bit out of line so it was a good opportunity to sort it out. The Team Rocket set-up certainly raises the point of the spinner up about 10 inches or so, thus the aircraft has a more aggressive stance on the ground. We weighed her today and there was minimal change to the empty weight but arm has moved aft 3.5 inches to 87.72" aft of datum. We don't have any drawings so I was wondering if someone out there could give me the moment arms for pilot, passenger, fuel and baggage so I can do some loaded CG calculations to keep our Feds happy?? Our flight limitations sheet lists the forward limit as 83.2" and the aft limit as 93.9" Thanks to Mark at Team Rocket - he was very helpful! Best regards, Jay New Zealand class="">http://www.matronics.com/Navigator?Rocket-List class="">http://forums.matronics.com class="">http://www.matronics.com/contribution ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rocket-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Rocket-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rocket-list Browse Digests http://www.matronics.com/digest/rocket-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.